HULL EXPERIMENTS ON 24-KNOT RO/RO VESSELS DIRECTED TOWARD FUEL-SAVING APPLICATION OF COPPER NICKEL

Studies have been performed to evaluate copper-nickel as a hull material in either roll-bonded clad or in sheathed form for a large commercial vessel. To resolve uncertainties concerning copper-nickel's durability, two series of test programs were initiated. A complete rudder was sheathed and installed on the Great Land, a 24-knot roll-on/roll-off vessel which trades on a weekly schedule between Tacoma, Washington, and Anchorage, Alaska. The paper describes the method of sheathing in a commercial shipyard environment. The intent of the rudder test was to evaluate copper-nickel alloys in a complex flow region of the ship. These tests have shown that the copper-nickel material is extremely durable even in the conditions of Cook Inlet, where ice and abrasive silt in the water are encountered. The second series of tests was designed to study the actual erosion-corrosion resistance of copper-nickel alloys without influence from the hull or its cathodic protection system. A total of 11 copper-nickel panels was installed on the hulls of the Great Land and its sister ship, the Westward Venture. These panels were faired to, and electrically insulated from, the hull. Electrochemical corrosion techniques and ultrasonic thickness measurements were used to monitor the panels. Erosion-corrosion rate results after one year of testing are within tolerable limits for hull applications. Detailed results and their economic significance are presented. Cu-Ni-surfaced hulls show increasing promise as a viable alternative to painted steel for large commercial vessels.

  • Supplemental Notes:
    • Paper presented at SNAME Annual Meeting, November 16-18, 1978.
  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  USA  07306-2907
  • Authors:
    • Schorsch, E
    • Bicicchi, R T
    • Fu, J W
  • Publication Date: 1978-9

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Filing Info

  • Accession Number: 00184810
  • Record Type: Publication
  • Source Agency: Society of Naval Architects and Marine Engineers
  • Report/Paper Numbers: Paper No. 9
  • Files: TRIS
  • Created Date: Jan 13 1979 12:00AM